// 云函数入口文件
const cloud = require('wx-server-sdk')

cloud.init()
const db = cloud.database()
// 云函数入口函数
exports.main = async (event, context) => {
  try {
    return await db.collection('comments').where({bookid: event.bookid})
      .limit(20)
      .get()
  } catch (err) {
    console.error(err)
  }
}